In my current project, they release the fix and new build quite often but I don’t have enough time to write test cases. I just have enough time to check the fix the developers made. It works quite well for me so far but my boss wants me to write test cases for future regression too. The problem is that it costs me a lot of time to write test cases.

My question is what should I do instead to maintain quality without having to write test cases?

Thanks in advance!